太阳成集团学术活动信息:王兆军教授学术报告2013.09.25

发布时间:2013-09-23   浏览次数:418

人: 王兆军  教授

       南开大学  博士生导师

报告题目:Nonparametric Maximum Likelihood Approach to Multiple Change-Point Problems

报告时间:2013925日下午3:30

报告地点:静远楼1508会议室

主办单位:太阳成集团、科技处

 

王兆军教授简介:

南开大学数学科学学院副院长,博士生导师。19907月于华东师范大学统计系毕业并获得硕士学位,199512月于南开大学数学科学学院毕业并获得博士学位。2000年晋升为教授,2001年被聘为博士生导师,共培养硕士研究生30多名,博士研究生10多名,其中两人获教育部学术新人奖,两人获南开大学宝钢特等奖,两人获“南开十杰”称号,一人获全国百篇优秀博士学位论文,一人博士论文于2012年被国家统计局评为全国统计优秀博士学位论文一等奖,两人博士论文被评为天津市优秀博士学位论文,一人获“钟家庆数学奖”,一人入选中组部首批青年拔尖人才及教育部新世纪优秀人才支持计划。

王兆军教授现任全国应用统计专业硕士研究生教学指导委员会委员、中国现场统计研究会副理事长、中国统计教育学会高等教育分会副会长、中国现场统计研究会生存分析副理事长、天津市统计学会副会长、天津现场统计研究会理事长、中国统计学会理事、《应用概率统计》编委、《数理统计与管理》副主编。

王兆军教授主要研究统计质量控制、高维数据分析、变点、变量选择,发表学术论文70余篇,包括在国际工业统计顶尖杂志Technometrics上讨论文章一篇。

 

 

报告摘要:

     In multiple change-point problems, different data segments follow different distributions where changes may be in the mean, scale or the entire distribution from one segment to another. Without the need to know the number of change-points in advance, we propose a nonparametric maximum likelihood approach to detecting multiple change-points. Our method does not impose any parametric assumption on the underlying distributions of the data sequence, which is thus suitable for detection of any changes in the distributions. The number of change-points is determined by the Bayesian information criterion and the locations of the change-points can be estimated by using the dynamic programming algorithm and further taking advantage of the intrinsic order structure of the likelihood function. Under some mild conditions, we show that the new method provides consistent estimation for both the locations and magnitudes of the change-points with a rate, $(\log n)^2$, where $n$ is the sample size. We also suggest a pre-screening procedure which is capable of excluding most of the irrelevant points. Simulation studies show that the proposed method has outstanding performance of identifying multiple change-points in terms of estimation accuracy and computation time compared with existing methods. The new methodology is illustrated with two real data examples.